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UL 353 Document Information:
Title
UL Standard for Safety Limit Controls
Underwriters Laboratories Inc.
Publication Date:
Sep 23, 1994
Scope:
These requirements cover limit controls, furnace fan controls,
and other interlocks which are essentially switches responding to
changes in liquid level, pressure, or temperature. Although not
limited to such specific applications, these safety controls
include those intended primarily to safeguard heating appliances,
heating systems, processing systems, and air-conditioning and
ventilating systems.
These requirements do not cover thermal protectors for motors
and fluorescent-lamp ballasts.
These controls are for use in ordinary locations. Requirements
for the installation and use of limit controls are included in
Standards of the National Fire Protection Association, such as
those for Installation of:
Air-Conditioning and Ventilating Systems, NFPA 90A-1993,
Warm-Air Heating and Air-Conditioning Systems, NFPA
90B-1993,
Oil-Burning Equipment, NFPA 31, ANSI Z95.1-1993,
National Fuel Gas Code, NFPA 54-1990,
Ovens and Furnaces, NFPA 86-1990, and
Prevention of Furnace Explosions in Fuel Oil and Natural
Gas-Fired Watertube Boiler Furnaces With One Burner, NFPA
85C-1991.
These requirements cover equipment rated not more than 600 volts
and intended for installation in accordance with the requirements
of the National Electrical Code, ANSI/NFPA 70.
A product that contains features, characteristics, components,
materials, or systems new or different from those covered by the
requirements in this standard, and that involves a risk of fire or
of electric shock or injury to persons shall be evaluated using
appropriate additional component and end-product requirements to
maintain the level of safety as originally anticipated by the
intent of this standard. A product whose features, characteristics,
components, materials, or systems conflict with specific
requirements or provisions of this standard does not comply with
this standard. Revision of requirements shall be proposed and
adopted in conformance with the methods employed for development,
revision, and implementation of this standard.
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